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Finding the Fourth Proportional to 625.34, 938.78 and 405.24

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Solution

The fourth proportional to 625.34, 938.78 and 405.24 is: 608.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.34 : 938.78 = 405.24 : x
  2. Step 2: Convert to fraction form
    625.34/938.78 = 405.24/x
  3. Step 3: Cross multiply
    625.34x = 938.78 × 405.24
  4. Step 4: Simplify right side
    625.34x = 380,429.18
  5. Step 5: Solve for x
    x = 380,429.18/625.34
  6. Step 6: Final answer
    x = 608.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.